Adult Harry Potter Robe Adult Halloween Costumes – This officially licensed adult Harry Potter Costume Robe is a black and red robe with clasp. The Adult Harry Potter Costume Robe is available in size Adult Standard. The Harry Potter Costume Robe is an officially licensed product. Choose from lots of Harry Potter Costume accessories below to complete your Harry Potter theme! This Harry Potter costume is for men and/or women! The students at Hogwarts all wear the same robes, whether they are a man or a woman. The Adult Harry Potter Costume is for ALL witches AND warlocks who attend Hogwarts! Don’t forget to check below for a magical selection of Harry Potter costume accessories! Now, even the “Big Kids” can be members of Gryffindor!